chore: update changes

changes/ce/feat-12396.en.md

@@ -0,0 +1,5 @@
+Enhanced the `authentication/:id/import_users` interface for a more user-friendly user import feature:
+
+- Add new query parameter `type=plain` to support importing users with plaintext passwords,
+  not just hashed ciphertext passwords.
+- Support `content-type: application/json` to accept HTTP Body in JSON format, not just file.